One-norm geometric quantum discord of two-qubit state in spin chain environment at finite temperature

Jin-Liang Guo and Chang-Cheng Cheng

Physica A: Statistical Mechanics and its Applications, 2015, vol. 432, issue C, 391-399

Abstract: We study the dynamics of quantum correlations measured by quantum discord (QD) and one-norm geometric quantum discord (GQD) in a two-qubit system coupled to an XY spin chain with finite temperature. It is shown that one-norm GQD is more robust than QD against the decoherence induced by the spin chain with finite temperature, and one-norm GQD is superior to QD in detecting the critical point of quantum phase transition (QPT) of the spin chain. Considering the effects of the state parameters, the temperature of the spin chain and the asymmetric coupling parameter, we analyze the phenomenons of sudden transition and double sudden transitions occurred in the evolutions of QD and one-norm GQD. Besides, the influences of the Dzyaloshinsky–Moriya (DM) interaction and the three-site interaction in the spin chain are also taken into account.

Keywords: Quantum correlations; Quantum discord; Decoherence; Quantum phase transition; Sudden transition; Spin chain (search for similar items in EconPapers)
Date: 2015
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Persistent link: https://EconPapers.repec.org/RePEc:eee:phsmap:v:432:y:2015:i:c:p:391-399

DOI: 10.1016/j.physa.2015.03.028

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